[tex] - \frac{1\frac{5}{4} \times 1 \frac{1}{3} }{ - \frac{1}{10} \div 1 \frac{1}{9} } = - \frac{ \frac{9}{4} \times \frac{4}{3} }{ - \frac{1}{10} \times \frac{10}{9} } = - \frac{3}{ - \frac{10}{90} } = - (3 \div ( - \frac{10}{90} ) = - (3 \times ( - 9)) = - ( - 27) = 27[/tex]
